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Inductance and Capacitance INEL 4075 –Chapter 7 Dr. Sandra Cruz-Pol Professor Electrical & Computer Engineering UPRM

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Capacitors Capacitors store electrons in form of separated charge or E field. http://www.kpsec.freeuk.com/components/led.htm

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Capacitance, in Farads [F] The capacitance is The charge The current in a capacitor The voltage, cannot change instantaneously

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Capacitors Energy stored in capacitor Parallel and Series capacitors

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Electric Circuit

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Discharging a capacitor

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Charge/discharge Capacitor Piezo- electric material

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Chip – (integrated circuits) The 555 timer regulator pin layout (from http://www.doctronics.co.uk/555.htm)http://www.doctronics.co.uk/555.htm

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1k C ( F)Frequency (Hz) C1.100111 C2.068170 C3.047230 C4.033348 C5.022490 C6.015718 C7.0101,173

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What is a circuit Board? Nodes?

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Myth: Why is the Ocean Blue? FALSE: The ocean is blue because the sky reflection on its surface. TRUE: Water is blue. frequency spectra But you need a huge amount of it to really see its color. Look at a swimming pool as it gets deeper; even on cloudy days. http://ece.uprm.edu/~pol/OceanBlue.html

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Myth #2 FALSE: Thomas Edison, greatest contributor to Electricity and systems used today. TRUE: Nikola Tesla – greatest contributor to Electricity. Invented ac motor, perfected dc motor, invented radio transmission, (wireless) designed Niagara Falls generator, distribution systems, fluorescence lamps, remote control, wireless, logic circuits, 3 phasic and many others.

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Inductors Store magnetic fields Symbol

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Inductors Energy storage – inductors store energy in the form of a magnetic field Series and parallel inductance Initial conditions of switch circuits solenoid

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Inductance, in Henries [H] The inductance is The voltage in an inductor The current, cannot change instantaneously

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Inductors Energy stored in inductor Series and Parallel inductors

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Where to find this material? http://ece.uprm.edu/~pol/cursos/cursos Also look at: http://casa.ece.uprm.edu http://ece.uprm.edu/climmate

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